Graphic recorder.



0. B. THWING.

GRAPHIC RECORDER. APPLICATION FILED AUG. 26,1911.

1,046,680. Patented 960.10, 1912.

2 SHEETSSHEET 1.

WITNESSES CZQVM'CM B, 3

g. M I 41/017,

G. B. THWING.

GRAPHIC RECORDER.

APPLICATION FILED AUG. 25, 1911.

1,046,680. Patented Dec. 10, 1912 9. SHEETS-SHEET 2,

UNITED STATES PATENT CHARLES B. THWING, F PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO THWING: INSTR'QBIENT COMPANY, OF PHILADELPHIA, PENNSYLVANIA, A CORPORATION OF PENNQYLVANIA.

To all, whom it may concern:

Be It known that I, CHARLES E. Tmvmo, a citizen of the United States, residing at Llhiladelphia, in the county of Philadelphia and State of Pennsylvania, have invented certain new and useful Improvements in Graphic?Zecorders, of which the following is a specification.

My irivention relates to an impiwei'nent in grapl'iic recorders, and it consists in a recordcr which will facilitate the making on .2: single record sheet or chart of a plurality of records in t'recpicnt succession from a plurality ()ll"S( lll'CS, these records being 1" peatedso as to give essentially a continuous record of all'th'e'sources of energy. F or example, it it bedcsircd to record on asingle chart the electric current consumed on a plurality oil-circuits, the several circuits will he automatically switched. into the recorder in regular succession, my improve-' time consist of a registering element and a surface Which receives the record made by the registering element, the latter of which moves in a given direction with the lapse of time, the former remaining in operative recording contact with the recording surface varying lengths of time accordingly as one or another source of energy is turned into the recorder. In such recording instruments. the receiving element, called hereinafter the chart, moves over equal intervals in equal times, sometimes continuously and sometimes by short steps with. intervening intervals of rest. The recording element, hereinafter called the pen, may be depressed or otherwise caused to record on the chart at intervals,- or it may be caused to remain continuously in cont-actwith the chart.

Specification of Letters Patent.

GRAPHIC RECORDER.

Patented Dec. Ml, 1912..

Application filed August 26, 1911. Serial No. 646,276.

I shall now describe my invention so that. others skilled in the art to which it appertains may manufacture and use the some, reference being had to the accompanyin drawings, forming part of this specification in which,

Figure l a face View of a recordercmbodyinn my invention. Fig. '2 is a top plan view of the lower ontact levers and of the depressor lever.

3 is atop plan view of the upper contact lever. Fig. 4 is a cross-section, on the line TV IV of Fig. 1. Fig. is a. top plan view of a portion of the contact Wheels and of the depressor Wheel. Fig. (3 is a portion of a chart showing a record such as would be made by the recorder shown in l to 5.

Like symbols of reference indicate like parts in the several figures.

In the drawings, Zindicates the needle or pen of any ordinary form of galvanometer (not shown), which needle or penis adapted to he brought at regular intervals in recording contact with the chart 4, but is free during the time it is-not in recording contact to move from side tov side of the chartin accordance with the fluctuations of the current actuating the gulvanometcr. The chart 4%; is held against the drum 5 and compelled to travel therewith by two counterbalancing Weights 4. This drum 5 is actuated and moved a. constant speed by a pinion 6., which in turn is operated by a pinion 7 ofany suitable clock Work mechanism. The pinion? meshes with the small pinion 8, on the shaft :ofwhich is mounted the pinion 9, and-this pinion 9, through suitable pinions 10, 11, 12 and 13, drives at a.const-ant rate of speed'the pinion lei. upon the shaft 15 of .vv'hich are fixedly mounted the contactwheels 16 and 17, and the depressor Wheel 18, these Wheels beingprovided Withteeth 16. 1'7 and 18.

Pivotally mounted'fon the pin 19 is the upper contact. lever 20, carrying a contact 21., the lever 20 resting on a stop 22 and being held against the same by a weight 23 on the free end of the lever. The contact 2]. is connected to the galvanometer by a Wire 21. The lower contact levers 24 and 25 carrying the contacts %--and 25 are pivotally mount.-

- said yoke and with it the rod 30 downwardly and taking the end 31 ofthe depressor out pen from recording engagement with the ed on a pin 26. A depressor lever 27 is also pivotally mounted on the pin 26'. At its outer end the depressor-lever 27 has a weight 28, which is adapted to slide up and down in ayoke 29, extendingfrom the upper end of which is a rod 30 connected to one end 31 of a depressor 31, pivoted at 32.

33 is a binding post to which is attached the wire leading out of the galvanometer, and 34 and 35 are the binding posts to which are connected the leading in wires of the two circuits, these binding posts being connected to the lower contacts 2 1 and 25 by wires 34; and 35.

The operation of my improved recorder, shown in Figs. 1 to ,5, is as follows: By means of the pinions 6 to 14:, inclusive, of the clockwork mechanism, the drum 5 carrying the chart 1, the contact wheels 16 and 17, andthe depressor wheel 18, are rotated in proper relation one to the other. The rotation of. each of the contact wheels 16 and 17 will bring alternately the teeth-16 and 17 of the contact wheels 16 and 17, under the legs 24* and 25 of the contact levers 24 and 25, which movement will alternately raise said contact levers, carrying the contacts 24 and 25, and bring said contacts alternately against the contact 21, completing the galvanometer circuit and causing the galvanometer needle to move to a position -to register the current passing through the instrument. Simultaneously with the bringing of either of the lower contacts 24 or 25 into electrical connection with the uppercontact 21, the depressor lever 27, by reason of its leg 2'?" coming into contact and riding up on the teeth 18' of the depressor wheel, is raised at its outer end against the top of the yoke 29, thereby raising the rod 30, which pressing upwardly against the end 31 of the depressor 31, de-

presses the end 31 of said lever against the galvanometer needle 2 and brings its pen 2 against and into recording engagement with the chart 4. Simultaneously with the drop ping of either of the contact lever legs 2? or 25 from the teeth 16' or 17 thus breaking the galvanometer circuit, the depressor lever leg 27 will drop from the apex of one tooth 18 into the bottom portion of another tooth which movement is made certain by. the Weight 28.

The downward motion of the depressor lever-27 brings its weight 28 agalnst the bottom of the yoke 29 carrying of contact with the needle 2. Upon being relieved from pressu're the needle will im mediately sprlng upwardly and release its chart. The construction of the contact wheels and 17 issnchlthat the,contact 25' is held in c rcuit with the contact '21 a aoaaoeo greater length of time than the contact 24, and consequently a longer mark is made on the chart 4 by the pen 2' when the former is in circuit than when the latter is. In this way the records on the chart of the two circuits are clearly distinguishable, as shown in Fig. 11. It will be readily apparent that the circuits may be increased as desired by merely increasing the contact wheels and contact lovers to correspond with the number of circuits. The depressor wheel 17 would of course have to be changed accordingly.

The mechanical or automatic means employed in the construction just described for throwing the several sources of energy successively into connection with the recorder may be varied at pleasure, as may also the means used to vary the distance moved by the chart during any given interval of con tact with the pen. I

It will be understood that various changes may be made in the mechanical details of my improved recorder without sacrificing any of its advantages or departing from the spirit of the invention.

The advantages of my improvement will be readily apparent to those skilled in the art. My improved recorder is sim 1c in construction, compact, and very relia is in operation.

I claim 1 In an automatic multiple recorder, the combination of a movable chart-carrying device, a recording instrument responding to a plurality of sources of energy, and means for varying the length of time of contact of said recording instrument with the chart accordingly as the recording instrument is connected to one or another of said sources of energy.

2. In an automatic multiple recorder, the

ter contact, a plurality of contact levers car rying circuit contacts, and a plurality of contact wheels adapted to' move said contact levers so as to bring said circuit contacts in succession into electrical connection with said alvanometer contact. I

4. u an automatic multiple recorder, the combination of-a galvanometer, a chart-carrying device, a recording pen, a galvanometer contact, a plurality of contact levers carrying Qircuitcontacta-a plurality of contact wheels adapted to movesaid contact levers so a'sto the chart, contact wheels, and depressor bring said circuit contacts in succession into wheel at suitable rates of speed. 1 9 electrical connection with said galvanometer In testimony whereof I afiix my signature contact, a depressor, for bringing the pen in presence of two witnesses.

into recording engagement with the chart, CHARLES B. TH\VING a depressor lever for actuating the de-' \Yitnesses: pressor, a depressor wheel for operating the D. O. DRAPER,.

depressor lever, and mechanism for moving 4 A. J. lVEtSS. i 

